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https://svn.open-mpi.org/trac/ompi/wiki/ProcessPlacement The wiki page is incomplete at the moment, but I hope to complete it over the next few days. I will provide updates on the devel list. As the wiki page states, the default and most commonly used options remain unchanged (except as noted below). New, esoteric and complex options have been added, but unless you are a true masochist, you are unlikely to use many of them beyond perhaps an initial curiosity-motivated experimentation. In a nutshell, this commit revamps the map/rank/bind procedure to take into account topology info on the compute nodes. I have, for the most part, preserved the default behaviors, with three notable exceptions: 1. I have at long last bowed my head in submission to the system admin's of managed clusters. For years, they have complained about our default of allowing users to oversubscribe nodes - i.e., to run more processes on a node than allocated slots. Accordingly, I have modified the default behavior: if you are running off of hostfile/dash-host allocated nodes, then the default is to allow oversubscription. If you are running off of RM-allocated nodes, then the default is to NOT allow oversubscription. Flags to override these behaviors are provided, so this only affects the default behavior. 2. both cpus/rank and stride have been removed. The latter was demanded by those who didn't understand the purpose behind it - and I agreed as the users who requested it are no longer using it. The former was removed temporarily pending implementation. 3. vm launch is now the sole method for starting OMPI. It was just too darned hard to maintain multiple launch procedures - maybe someday, provided someone can demonstrate a reason to do so. As Jeff stated, it is impossible to fully test a change of this size. I have tested it on Linux and Mac, covering all the default and simple options, singletons, and comm_spawn. That said, I'm sure others will find problems, so I'll be watching MTT results until this stabilizes. This commit was SVN r25476.
86 строки
3.3 KiB
Plaintext
86 строки
3.3 KiB
Plaintext
#
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# Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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# University Research and Technology
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# Corporation. All rights reserved.
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# Copyright (c) 2004-2005 The University of Tennessee and The University
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# of Tennessee Research Foundation. All rights
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# reserved.
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# Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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# University of Stuttgart. All rights reserved.
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# Copyright (c) 2004-2005 The Regents of the University of California.
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# All rights reserved.
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# Copyright (c) 2006 Cisco Systems, Inc. All rights reserved.
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# $COPYRIGHT$
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#
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# Additional copyrights may follow
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#
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# $HEADER$
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#
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# This is the default system-wide MCA parameters defaults file.
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# Specifically, the MCA parameter "mca_param_files" defaults to a
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# value of
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# "$HOME/.openmpi/mca-params.conf:$sysconf/openmpi-mca-params.conf"
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# (this file is the latter of the two). So if the default value of
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# mca_param_files is not changed, this file is used to set system-wide
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# MCA parameters. This file can therefore be used to set system-wide
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# default MCA parameters for all users. Of course, users can override
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# these values if they want, but this file is an excellent location
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# for setting system-specific MCA parameters for those users who don't
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# know / care enough to investigate the proper values for them.
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# Note that this file is only applicable where it is visible (in a
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# filesystem sense). Specifically, MPI processes each read this file
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# during their startup to determine what default values for MCA
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# parameters should be used. mpirun does not bundle up the values in
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# this file from the node where it was run and send them to all nodes;
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# the default value decisions are effectively distributed. Hence,
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# these values are only applicable on nodes that "see" this file. If
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# $sysconf is a directory on a local disk, it is likely that changes
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# to this file will need to be propagated to other nodes. If $sysconf
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# is a directory that is shared via a networked filesystem, changes to
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# this file will be visible to all nodes that share this $sysconf.
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# The format is straightforward: one per line, mca_param_name =
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# rvalue. Quoting is ignored (so if you use quotes or escape
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# characters, they'll be included as part of the value). For example:
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# Disable run-time MPI parameter checking
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# mpi_param_check = 0
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# Note that the value "~/" will be expanded to the current user's home
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# directory. For example:
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# Change component loading path
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# component_path = /usr/local/lib/openmpi:~/my_openmpi_components
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# See "ompi_info --param all all" for a full listing of Open MPI MCA
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# parameters available and their default values.
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#
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# Basic behavior to smooth startup
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mca_component_show_load_errors = 0
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mpi_param_check = 0
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orte_abort_timeout = 10
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hwloc_base_mem_bind_failure_action = silent
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## Protect the shared file systems
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## Add the interface for out-of-band communication
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## and set it up
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oob_tcp_peer_retries = 120
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oob_tcp_disable_family = IPv6
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#oob_tcp_connect_timeout=600
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## Define the MPI interconnects
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btl = sm,tcp,self
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## Setup shared memory
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btl_sm_free_list_max = 768
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## Setup TCP
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btl_tcp_if_include = ib0
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## Configure the PML
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pml_ob1_use_early_completion = 0
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